JPH032062U

JPH032062U -

Info

Publication number: JPH032062U
Application number: JP5987589U
Authority: JP
Priority date: 1989-05-23
Filing date: 1989-05-23
Publication date: 1991-01-10

Description

[Brief explanation of drawings]

第１図、第２図、第３図はそれぞれ請求項第１
項、第２項、第３項駆動装置の駆動状態切換回路
図、第４図はホイール式シヨベルの側面図、第５
図は従来技術駆動装置の駆動状態切換回路図であ
る。７……（駆動状態切換用）電磁弁、１０……操
作スイツチ、１２……走行・作業モード切換弁、
１３……モード切換スイツチ、１４……空圧源、
１５，１５′……走行機構、１８……駆動状態切
換部、２４……駐車ブレーキ装置、２７……速度
センサスイツチ、２８，３１……圧力スイツチ。 Figures 1, 2, and 3 are each claimed in claim 1.
Items 2 and 3 are drive state switching circuit diagrams of the drive device, Figure 4 is a side view of the wheel type shovel, and Figure 5 is a side view of the wheel type shovel.
The figure is a drive state switching circuit diagram of a conventional drive device. 7... Solenoid valve (for driving state switching), 10... Operation switch, 12... Travel/work mode switching valve,
13...Mode selection switch, 14...Pneumatic source,
15, 15'... Traveling mechanism, 18... Drive state switching unit, 24... Parking brake device, 27... Speed sensor switch, 28, 31... Pressure switch.

Claims

[Scope of Claim for Utility Model Registration] (1) In a drive state switching circuit of a construction machine equipped with a drive device that can be switched between a two-wheel drive state and a four-wheel drive state by switching an operating switch, the vehicle speed is detected. A speed sensor switch that operates and a pressure switch that operates by pressure applied to the drive state switching section are provided so that the drive state switching valve is operated only when the construction machine stops traveling. A driving device for construction machinery characterized by the following configuration. (2) Pressure activated by the pressure applied to the parking brake device in the drive state switching circuit of a construction machine equipped with a drive device that can be switched between two-wheel drive mode and four-wheel drive mode by operating a control switch. A switch and a pressure switch operated by pressure applied to the drive state switching part are provided, and the drive state switching valve is configured to be operated only when the construction machine stops running. Features of construction machinery drive devices. (3) In the drive state switching circuit of a construction machine equipped with a drive device that can be switched between a two-wheel drive state and a four-wheel drive state by switching an operating switch, a switch that operates in response to a travel/work mode switching valve. and a pressure switch operated by the pressure applied to the drive state switching part, and the drive state switching valve is configured to switch and operate only when the construction machine comes to a stop state. Drive equipment for construction machinery.